DIVERSIFIED MACHINE INC. 2020 PRODUCT GUIDE
Important XR-1, XR-2, XR-3 & BB-1 Information
Loaded Pinion Removal
Heat area around the pinion until the pinion is able to freely be removed.
DO NOT concentrate heat around the pinion nose bearing.
Loaded Pinion Installation
Heat area around the pinion until the pinion is able to freely drop into center.
DO NOT concentrate heat around the pinion nose bearing support.
Open Tube Rear Set-Up
After installing pinion allow rear to return to room temperature. (70° F) Adjust pinion nut until 25 in./
lbs. rotational preload is achieved without the spool. Lubricate posi-retainer o-ring and install posi-lock
retainer on pinion nut using finger pressure only. Rotate retainer if needed to align locking
splines. Install axle with starting shim recommendations found under the important specs section
for the model rear being rebuilt. Install sidebell and tighten four nuts to 30 ft/lbs. Verify pinion
backlash to be .004"-.008" minimum when checked on 10 spline tooth of pinion using dial indicator.
Adjust spool shims accordingly until desired amount of pinion backlash is achieved. Once desired
amount of pinion backlash is achieved verify rotation pinion preload to be 45in/lbs. Once set-up is
complete remove side bell. Install side bell seal, o-rings and axle seals. Re-install side bell with ring
gear back stop in place. Torque side bell nuts to 30 ft. /lbs. Tighten ring gear backstop against ring
gear and back off 1/8 turn. Jam ring back stop nut.
IF YOU DON’T KNOW - CALL!!!!
If you don’t feel comfortable rebuilding your own quick change rear DMI can do it for you. For
$99 plus parts we’ll rebuild any brand open tube quick change rear. Need help with shipping?
Skid up your rear and contact us to schedule a freight pickup. We’ll share our carrier
discount with you to keep your freight costs minimal. Allow two weeks in most cases. Faster
turnaround available in emergency situations.
BULLDOGREARS.COM | 717.397.5347 | DIVERSIFIEDRACING.COM 43
Did you
know
Use spray or dry graphite on axle nuts prior to installation. The graphite prevents
sticking and doesn't attract dirt. When the car comes off the track, loosen axle nuts.
Failure to loosen nuts on a 'hot' axle may result in axle nuts sticking.
SPLINE’s
tip